Improvement in dies for heading bolts



UNITED STATEs PATENT CDEEIoEa JAMES B. CLARK, 0F PLANTSVILLE,CONNECTICUT.

IMPROVEMENT IN DIES FOR HEADING BOLTS.

Specification forming part of Letters Patent No". 123,084, dated January30, 1872 antedated January 13, 1872.

I, JAMEs B. CLARK, of Plantsville, in the county of Hartford and Stateof Connecticut, have invented a new and Improved Die for Sq'uaring andHeading Bolts, of which the following is a specification: l

This improvement relates to the dies which square a portion ofthebolt-blank and hold the same in place while being headed; and consistsinthe employment of two sets of squarin g-dies, one set of which diesafter being made square are still further recessed apart of theirlength, as and for the purpose hereinafter described.

In the accompanying drawing', Figure l is a front View ofthe squaringand heading dies; Fig. 2, a plan view of the under side of thesquaring-dies; Fig. 3, a face view of one of said dies; Fig. 4, a sideelevation of a bolt as made by my improved dies; and Fig. 5, a sideeleva tion oi' a bolt Inade by a pair of ordinary dies.

The ordinary mode of making this class of bolts is to gripe and squarethe blank in a single set of square dies, in which it remains while thehead is formed. The dies are then opened, the bolt given a quarter turn,when the same dies and heading-tool are again brought upon the bolt. Theresult is that the two corners of the bolt which are on the dividingline of said dies when the blfank is iirst squared are full and square,while the other corners of the square do not till, as shown at a, Fig.5, with the exception of a short dista-nce from the head, which is upsetand thus filled by the action of the heading-tool. The object of myinvention is to forge bolts with all of the cor- 11ers of the squarefull and sharp.

A designates an ordinary headingtool, with the exception that its facehas a duplicate recess for forming the head. B B designate blocks, inwhich are the squaringdies b b. These are arranged in' any of theordinary heading-machines so that the blocks .B B sha-ll move laterally,and thus open sufficiently to receive the bolt-blank, while theheading-tool A must be arranged to move verticallyy or swing upon analigner. The face of the dies b', af-

ter being made square like dies b, are cut away near the corners to formthe recesses c c, which extend from the bottom ofthe dies to near thetop of the saine. A round blank, having the portion to be squared madelarger than that portion which is to remain round, is properly heatedand placed between dies b', which are then closed, and thus formthelarge part of the blank into the form of said dies, and also holdthe. blank while the heading-tool A descends and forms the head. Thedies are then opened, the bolt given a quarter turn and placed in diesb, when the dies b and headingtool A are brought to bear upon the bolt,which iinishes the forging of the same.

It will be observed that the dies b', except near the top, are free fromany sharp and angular corners, whereby the iron readily ills `the dies,to the extreme corners of the saine,

which it would not do if the saine were sharp and square. Thus a surplusor ample amount of stock is left near the corner of the square, whichthe second set of dies b readily form into a square with full corners.The corners of the square which are on the dividing line of the dieswhen the blank is first struck, and all ofthe corners for a shortdistance from the head, will always form full and square in an ordinarysquare die. For this reason, the recesses c c do not extend the wholelength of the dies, and are made foronly two of the corners.

By striking the blank first in a die having no angular corners, asdescribed, and then iinishing in a square die, the dies are found tolastto square a much larger number of bolts than will square dies. l

I claim as my invention- Jointly, the die b with its recesses c c andthe die b for use successively in the formation ofthe square neck on theenlarged cylindrical portion of a cylindrical bolt-blank, as described.

JAMES B. CLARK.

Witnesses:

HEBER S. IvEs, JAMES SEEPAED.

